DataProvider-interface implementeren

Last update: Mon Mar 24 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

Gemaakt voor:

  • Beginner
  • Ontwikkelaar

Creeer een project van AEM gebruikend het recentste archetype en voeg de volgende code aan het project toe.
Doorgaans worden de gegevens opgehaald van een externe gegevensbron, zoals een database, Azure Storage, S3 bucket of een andere bron. U moet de code schrijven om de gegevens op te halen.

package com.aemforms.prefill;

import com.adobe.forms.common.service.*;
import com.aemforms.saveandfetchfromazure.StoreAndFetchDataFromAzureStorage;
import org.apache.commons.lang3.StringUtils;
import org.apache.sling.api.resource.Resource;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.adobe.forms.common.*;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Map;

@Component(
        service={DataProvider.class, CustomAFPrefillService.class},
        immediate = true
)
public class CustomAFPrefillService implements DataProvider {
    @Reference
    private DataManager dataManager;

    @Reference
    private StoreAndFetchDataFromAzureStorage storeandfetch;

    private transient Logger  logger = LoggerFactory.getLogger(CustomAFPrefillService.class);

    @Override
    public PrefillData getPrefillData(DataOptions dataOptions) throws FormsException {
        logger.info("Invoking AF custom prefill service");
        // get the value of the request parameter called guid from the url
        String guid = (String) dataOptions.getExtras().get("guid");

        // fetch the data associated with the guid using a custom OSGi service or in any other manner

        String data = storeandfetch.getBlobData(guid);
        InputStream dataInputStream = null;
        ContentType contentType = dataOptions.getContentType();

        Map<String, Object> extras = dataOptions.getExtras();
        List<FileAttachmentWrapper> fileAttachmentWrappers = null;
        PrefillData prefillData = null;
        Map<String, String> customContext = null;
        if(extras != null && extras.containsKey(DataManager.UNIQUE_ID) && dataManager != null) {
            String dataKey = extras.get(DataManager.UNIQUE_ID).toString();
            if(dataManager.get(dataKey) != null) {
                data = (String) dataManager.get(dataKey);
                fileAttachmentWrappers = (List<FileAttachmentWrapper>) dataManager.get(DataManager.getFileAttachmentMapKey(dataKey));
            }
            customContext = dataManager.getCustomContext(dataKey);
        }
        if(StringUtils.isNotBlank(data)) {
            dataInputStream = getDataInputStream(data);
            prefillData = new PrefillData(dataInputStream, contentType, fileAttachmentWrappers, customContext);
        }
        return prefillData;


    }

    @Override
    public String getServiceName() {
        return "Core Custom Pre-fill Service";
    }

    @Override
    public String getServiceDescription() {
         return "Core Custom Pre-fill Service";
    }
    private InputStream getDataInputStream(String data) {
        InputStream dataInputStream = null;
logger.info("got data  "+data);
        try {
            dataInputStream = new ByteArrayInputStream(data.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            logger.error("[Custom AF Prefill] Exception in custom af prefill service", e);
        }
        return dataInputStream;
    }
}